Sari, W. I., and S. W. Purwanza. “Correlation Between Age, Gender, and Formal Education With Symptom Clusters in Head and Neck Cancer Patients: An Observational Study”. 2022. Health Information : Jurnal Penelitian, vol. 14, no. 2, Dec. 2022, pp. 153-60, doi:10.36990/hijp.v14i2.494.